Callstack

The Account Growth Manager is responsible for maintaining strong client relationships and driving revenue growth through strategic account development and upselling. They act as a bridge between business value and technical innovation, collaborating with delivery teams to execute growth strategies.

Design and implement end-to-end LLM and multi-agent architectures for enterprise clients across cloud and edge environments. Lead AI governance, monitoring, and R&D initiatives while mentoring other engineers.

Act as a technology consultant to help clients build cross-platform products and solve complex programming issues. Collaborate with global teams and contribute to the Open Source community and R&D activities.

The Head of Customer Success will own and scale a 150–200M PLN revenue portfolio while leading a team of 3–5 Account Managers. They will act as a strategic bridge between client business needs and technical innovation to drive long-term partnerships and revenue growth.